如图,在笔直的某公路上有A、B两点相距50km,C、D为两村庄,DA⊥AB于

如图,在笔直的某公路上有AB两点相距50kmCD为两村庄,DAAB于点ACBAB于点B,已知DA=30kmCB=20km,现在要在公路的AB段上建一个土特产品收购站E,使得CD两村到收购站E的距离相等,则收购站E应建在离A点多远处?

 

答案

解:设E建在离AX km

       

依题意得

E建在离A20km.

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